Sexism in Traditional Male Jobs

I read a history of technology in 5 or 6 volumes. In the Middle ages or so they had women in factories with looms or similar and a picture showed a male supervisor patting some young woman's butt, harassing her. Nothing changes much. Automation puts women into more male positions. The first secretaries were males. Of course everyone sees this as a woman's job now. Try as a woman working at a mine, in a big trucking rig, in a construction site. They won't like it. Male dancers and models can be generally seen in the public sphere as gay. Office, medical, teaching is becoming sex neutral. Most nurses are female. Most surgeons are still male, anesthetist are mixed. Early education teachers are female. High school teachers are mixed. Store managers are male but cashier personnel are mixed or mainly female. These roles change as perceptions change. Men want to work more,earn more, have higher status all things being equal. I.e. from equal social background,intelligence, higher in birth order.